Problem with Iraq is that Bush (short version of word idiot) expected that there will be society ideal like American. People who feel national identity, don't have real fairth (by real I mean strong) and complety without big social connections.
Then they noticed that people of Iraq is completely different. That they can easy organise themselves and they want fight in the name of god. So that they established "iraqui autonomic government" - count mostly from Iraqui emigrants.
Bush forgot to check who are those emigrants - actually big part of them were drug dealers. So we had corrupted government and american soldiers without any respect for culture and tradition of Iraq. And when they started torturing people into Abu Graib, they became nice targets :)
Americans should do better into 2002 - they should establish new government on tribal and religious leaders. That would help them control society because family connections would be supported by respect of religion.

Now Americans have to smile when Juba shot.